The 26.20 mile (42.2 km) route makes a circumnavigation of the Snowdon massif, starting and finishing at Llanberis, following the A4086 and climbing to the top of the Llanberis Pass (Pen y Pass 1,100ft).

Dropping down to the Pen Y Gwyryd junction, the race then follows the old road along to the campsite until it joins the A498.

This 2km farm track section, downhill, is then followed by a return to tarmac. There is a short, sharp uphill back up to the main road at the campsite before the route continues to Beddgelert (200ft) and along the A4085 to Waunfawr.

From here it is a rapid climb to about 1,200ft at Bwlch y Groes (a short length is unmetalled) and then downhill to the finish in Llanberis.